What Suspension Part is this?
 

So after I did my differential fluid, trans fluid, FINALLY installed a new fan shroud, and got a new fan clutch.

I noticed this was worn out. What do you call it? It's the lower control arm bushing right?

Lower ball joint. (MB calls it the support joint.)

The bushing is on the frame end of the control arm.

Thank you!

But i'm still confused as to which one is the right part.

1986 Mercedes-Benz 300SDL Base Sedan - Suspension, Shocks & Springs - Page 3

Go back to Page 2. Down at the bottom you have a selection. They call it the Control Arm Joint. 1986 Mercedes-Benz 300SDL Base Sedan - Suspension, Shocks & Springs - Page 2

Part #116-333-09-27

Don't know about your car, but on my 1985 300D it is tricky to replace. Yours looks similar. There are several posts w/ photos. You must remove the spindle to work on the bench. Getting the old out isn't too hard (beat w/ large hammer). You need a C-clamp ball joint press to install the new one, and some patience.

I pretty much have to buy the c clamp ball joint press that is offered in a kit correct?

A generic ball joint press won't do you any favors. If you are interested in borrowing the correct tool, PM me for more info.

I used a generic balljoint C-clamp press on my w123, you just have to be a bit creative. I modified one of the things and it worked fine.

https://i.imgur.com/ufVotnth.jpg